The TCA cycle occurs inside mitochondria, producing reducing intermediates that carry electrons to the electron transport chain.

“that asset ilka way goes into the inside of the primordial bacteria which is where we see the TCA cycle or the Krebs cycle right there was another Nobel laureate Albert's spent Gorgui who discovered two of the the sort of intermediates in the krebs cycle the Krebs cycle is the source of much consternation but this there's this interior cycle in the inside of the mitochondria where we are moving molecules around and making reducing intermediates or molecules like fadh2 nadh which carry electrons to the electron transport chain”